This is a well documented phenomenon:
https://forum.inaturalist.org/t/computer-vision-mistaking-plants-for-arthropods/53634
https://forum.inaturalist.org/t/leafminers-have-broken-the-cv/54378
It only suggests fish because the iconic taxon of the community taxon is a fish. This is how the CV knows when to identify the flower vs bug in a photo: it uses the current ID(‘s) to figure out the iconic taxon